Johnson Cogs wants to set up a line to serve $8080$ customers per hour. The work elements and their precedence relationships are shown in the following$$ table:

$$

Work Element

Time$($sec$)$

Immediate$$ Predecessor$($s$)$

A

$2727$

None

B

$2525$

A

C

$3434$

A

D

$2828$

B

E

$66$

B

F

$2020$

C

G

$1010$

C

H

$1414$

$$D$,$ E

I

$12$

$$F$,$ G

J

$26$

$$H$,$ I

Total

$202$

Suppose that a solution requiring five stations is obtained. What is its$$ efficiency?

$$